Well, glad I did a search before posting about the Speccy 'bug'.
For the record - new build with Sabrent Rocket NVMe 4.0, 1TB - no temp reporting (as all others have reported). Since this is my primary drive and is known to run hot, I need to monitor. I've installed the Sabrent dashboard, which is fine but only does Sabrent - obviously not good. Looks like I'll try out the other suggestions - many thanks to those who shared them.